Photon energy is the energy carried by a single photon. The amount of energy is directly proportional to the photon's electromagnetic frequency and thus, equivalently, is inversely proportional to the …

The Planck relation[1][2][3] (referred to as Planck's energy–frequency relation, [4] the Planck–Einstein relation, [5] Planck equation, [6] and Planck formula, [7] though the latter might also refer to Planck's …

The Planck constant, or Planck's constant, denoted by , is a fundamental physical constant of foundational importance in quantum mechanics: a photon 's energy is equal to its frequency …

Scheme of Kasha's rule. A photon with energy excites an electron of fundamental level, of energy , up to an excited energy level (e.g. or ) or on one of the vibrational sub-levels. Vibrational relaxation then …

It was originally defined as the energy in one mole of photons (6.022 × 1023 photons). [1][2] Because energy is inversely proportional to wavelength, the unit is frequency dependent. This unit is not part …

k = (kx, ky, kz) is the wave vector (in radians per meter), and ϕ 0 {\displaystyle \phi _ {0}} is the phase angle (in radians). The wave vector is related to the angular frequency by where k is the …

The spectral radiance can also be expressed per unit wavelength λ instead of per unit frequency. In addition, the law may be expressed in other terms, such as the number of photons emitted at a …

Photoemission of electrons from a metal plate accompanied by the absorption of light quanta – photons The photoelectric effect is the emission of electrons from a material caused by electromagnetic …